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These are solutions

For that reason, Wash Out is best used with Mono-Blue Commanders

Unfortunately, a Level 5 monster can't extend Rank 4 Xyz plays

Whether you're playing it in Control, Bant Field of the Dead, Esper Planeswalkers, or whatever other deck you're running, or your building your deck against it, be ready for Supreme Verdict with other countermeasures like Selfless Spirit or be ready to build a threat base that mixes in other threats like planeswalkers or vehicles to help insulate yourself

The player can use this effect as often as they want during their turn

You can play him on curve much much more safely than most planeswalkers because his effective cost is just two mana (normally, it can be a lot less if you have things that tap for more than one)